As installing git and MacPorts on my MAC wasn’t as simple as I thougt before, here are the necessary steps to get MacPorts and git on your Leopard:

Install Xcode 3.0, which can be found on your Mac OS Setup CD, or here.

Install X11, which you can also find on the OS X Setup CD

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Download and Install MacPorts

Update your ~/.profile:

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export PATH=/opt/local/bin:/opt/local/sbin:$PATH
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export MANPATH=/opt/local/share/man:$MANPATH

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Install git via MacPorts:

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sudo port install git-core

A more comprehensive guide on installing MacPorts can be found here.